Polyphase commutator-motor.



V. .A- PYNN. POLYPHASE COMMUTATOR MOTOR.

APPLICATION FILED JUNE 1, 1909.

960,882. Patented June 7,1916.

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POLYPHASE GOMMUTATOR MOTOR. AP"T-IGATION FILED JUNE-1,1909.

960,882. Patented June 7, 1910.

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UNITED STATES PATENT OFFICE.

VALERE ALFRED FYNN, OF LONDON, ENGLAND.

POLYPHASE COMMUTATOR-MOTOR.

Application filed June 1, 1909. .Serial No. 499,464.

To all whom it may concern:

Be it known that'I, VALi-IRE ALFRED FYNN, a subject of the King of England, residing at London, England, have invented a certain new and useful Polyphase Commutator- Motor, of which the following is such afull, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings forming part of this Specification.

My invention relates to polyphase commutater motors of the neutralized conduction type with a shunt characteristic.

it is the object of my invention to simplify the construction of these motors and to provide means for regulating their speed and controlling or improving their power factor. I 2

In the known motors of thistype. the stator carries an exciting and a neutraizing winding for each phase and this winding is connected in series relation with the rotor along an axis coinciding with that of the. neutralizing winding. The term neutralizing winding, of course, implies that said winding is so connectedthat its ampere turns oppose the rotor ampere turns in the axis of said winding and thus neutralize them to any desired extent. Now according to this invention'I dispense with all the usualadditional windings on the stator and utilize each neutralizing winding in at least two wa 's, iirstly as a true neutralizing winding an secondly as a field. and I can also use itas a phase compensating winding. Thus each phase of my motor comprises nothing but a working circuit consisting of a working winding disposed on the rotor and of a neutralizing winding disposed on the stator, the two windings are connected in series relation across one phase of the supply. Simultaneously another E. M. F. is impressed on one part only of this working circuit;

preferably on the neutralizing winding: this other E. M. F. must (litter in phase iron: that impressed on the whole working circuit and may be derived from one or more otthe phasesot' the supply. Any of the E. M. Ffs impressed on any part of the working circuit can be derived from the mains directly or by wa'y of transformers. 1V ith this arrangement I am able to vary the speed when Specification of Letters Patent.

Patented June 7, 1910.

my invention, Figure 1 is not an operative combination but simply illustrates the leading idea underlying the inventionand as. applied to one motor phase only. Fig. 2 is a two-phase motor with phase compensation and adapted for speed regulation; F ig. 3 is a modification of Fig. 2 showing two rotor windings, and Fig. 4 shows the invention as applied to a three-phase machine.

Referring to Fig. l, the E. M. F. P derived from the mains 1, 2 is impressed on the whole of the working circuit. The latter consists of the neutralizing winding 8 and the commuted winding 11. The t-wo are here connected directly in series by way of the brushes 9, 10. 1f speed regulation only is aimed at then an E. M. F. of same phase as P must be independently impressed on part only of the said working circuit,-for instance on 8, but if both speed regulation and phase coinpensating are to be achieved then'I impress on part only of the said working circuit an E. M. F. difi'eriug in phase from P 'This C; M. F. is here designated by P,{'P. and is impressed on 8 only. It can be derived from one or more phases of the supply differing from the phase 1, 2 or it can be. derived from the phase 1, 2 and from another phase of the supply. The speed is varied by varying the magnitude of the E. M. F. P impressed on the whole working circuit relatively to the LI. F. P impressed on part only'of that circuit and the power factor is controlled by varying the magnitude of P in P +P In Fig. 2 the two-phase operative combination consists of two transformers 32, 33 each having one primary 18 and 19, connected to the mains 1', 2 and 3, t respectively and each having two secondaries 23, 20 and 22, 31. The combination further comprises the reversing switches 14, 24. and 15, 29 by means of which the direction of rotation may be varied, the motor itself being provided with the commuted winding 11, two sets of working brushes 9, and 27, 28 and two neutralizing windings 8 and 26. The speed and power factor are controlled in the manner already set forth in Fig. 1. One working circuit comprises 8 and the commuted winding 11 along the axis of 8 by way of the brushes 9, 10; one E. M. F. is impressed on the whole oi this working circuit and it is derived from the primary 18 of 32 and can be regulated at 13 and reversed at 14. The

neutralizing winding 8 has also another E. M. F. impressed u on it which diifers in phase from that erived from 18.. This other E. M.- F. is derived from-the secondary 20 of 32 and the secondary 22 of 33 and it can be regulated at '16 and 17 and can be reversed at 15. The other working circuit comprises the neutralizing winding 26 and the commuted winding 11 along the axis of 26 by way of the brushes 27, 28. One E. M. F. is impressed on the whole of this working circuit and it is derived from the.

primary 19 of 33 and can be regulated at 25 and reversed-M124. The neutralizing winding. 26 has also another E. M. F. impressed upon it which'difi'ers in phase from that derived from 19. This ot er E. M. F, is derived from the secondary 21 of 33 and the secondary 23 of 32. It can be regulated at 31 and and reversed at 29.

In Fig. 3 is shown a modification of -Fig..

2, there being two commuted windings 11 and 12 on the-rotor, each connected to an independent commutator, furthermore the transformers only have one secondary each cuit for each phase connected to the source parts are similarly numbered in both figures.-

The operative combination shown in Fig. 4 illustrates a three-phase motorand comprises three transformers 34, 35, 36 star con-v nected to the mains 5, 6, 7 and.each provided with two secondaries 40, 41 also 42, 43 and 44, 45, and a motor having a commuted winding 11 on the rotor, three sets of brushes 56, 58, 60 and three neutralizing windings 55, 57, 59. N o reversing switches are shown although such may be'made use of in some such manneras indicated in Figs. 2 and .3. The motor bein star connected the three working circuits ave their neutral point in 11. One of these working circuits consists of the neutralizing winding 55 connected in series and in 0 position with 11 by way of brush 56. An M. F. derived from 37 and which can be regulated at 46 is impressed on the whole of this working circuit. Another E. M. F. derived in this case from the secondaries 42 and 44 of the transformers and 36. is impressed on only. This other E. M. F. difi'ers in phase from that derived from 34 and can be regulated at 53 and 54. It is apparent from Fig. 4 that the other two working circuits are connected in a corresponding manner.

Havin fully described my invention, what I c aim as new and desire to secure by Letters Patent-of the United States is:

'1. 'In a polyphase motor, at least two working circuits each connected to one hase of the supply and containing a neutra izing winding on thestationa'ry member and a commuted winding on the revolving member, said windings being coaxially connected in series relation, and means for impressing a second E. M. F. on a part only of each working circuit.

2. In a polyphase motor, at' least two working circuits each connected to one hase of the supply and containing a neutralizing winding on the stationary member and a commuted windin on the revolving member, said windings being coaxially connected in series relation, and means for impressing a second E. M. F.

ing.

3. In a polyphase motor, at least two working circuits each connected to one hase of the supply and containing a neutra izing winding on the stationary member and a commuted winding on the revolving mcmher, said windings being coaxially connected in series relation, anda transformer for each'wm'king circuit for impressing a second E. M. F. on 'a part only of said circuit.

4. In a polyphase motor, a working cirof supply and containing a neutralizing winding'on the stationary member and a commuted windin on the revolving memher, said windings lieing'coaxially connected in series relation and in opposition to each other, means for impressing a second E. M. F. on 3. art only of the workin circuit, and means or varying the phase 0 said second 5.111 a poly hase motor, a working circuit for each pliase connected to the source of supply and containing a neutralizing windin'g on the stationary member and a commuted windin on the revolving member, said windings eing coaxially connected in series'relat-ion and in opposition to each other, means for impressing a second E. M. F. on a part only of the working circuit, and means for impressin a third E. M. F. on a part only of the wor ing circuit.

on each neutralizing windof supply and containing a neutralizing.

winding on the stationary member and a commuted winding on the revolving memher, said windings being coaxially connected in series relation and in opposition to each other, means for impressing a second E. M. F.

on 2;. art only of the working circuit, means my hand and affixed my seal in the presence gr I; justing the magnitude of said second of the two subscribing witnesses.

'. F. means for impress'm a third E. M.

F. om part only of the xvoficingwvindin'g, VALLRE. ALFRED FYQIN f 5 and means 01: adjusting the magnitude of. \Vitnesses:

su'id third E. M. F. ELIZABETH BAILEY,

In testimony whereof I have hereunto set E. E. HUFFMAN. 

